On Thursday, 9 November 2006 22:30, Luca Tettamanti wrote:
> On 11/9/06, Rafael J. Wysocki <[EMAIL PROTECTED]> wrote:
> > I think that the swap header need not be continuous. This actually also
> > follows from the sys_swapon() code which reads one page from the file
> > using its mapping. It looks like setup_swap_extents() omits the first
> > continuous PAGE_SIZE "block" just in case it contains the header, but
> > the swap-handling will work even if it doesn't.
> >
> > However, in case this happens, swsusp and s2disk/s2both won't be
> > able to use the swap file for the suspend, because swap_type_of() will
> > fail.
> >
> > Now if that really is what happens (could you please verify with your
> > setup?),
>
> It seems so. What I see is the following:
>
> 0x0000-0x1000: header, not contiguous
> 0x1000-0x2000: nothing, this page is left empty
> 0x2000-EOF: swap data
>
> > it would be nice if your program detected such situations and informed the
> > user that the swap file could not be used.
>
> Basically:
> - find the first block of the swapfile
> - check that there's a contiguous PAGE_SIZE cluster
> - check signature
... and print the number if everything fits.
Rafael
--
You never change things by fighting the existing reality.
R. Buckminster Fuller
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